Calibration curve of candesartan cilexetil in phosphate buffer (pH 6.8). Candesartan cilexetil was dissolved in phosphate buffer (pH 6.8) at a concentration of 5, 10, 20, 30 and 50 µg.ml-1, and the U.V. absorbance at λmax 254 nm was gained. Data are represented as mean ± standard deviation of 3 independent experiments.